Davit for hoisting and lowering boats.



A. WELIN. r v DAVIT FOB, HGISTING AND LOWE-RING BOATS.

APPLICATION TILED DEC. 2, 1907.

Patented Oct. 26, 1909..

2 SHEIBTSSHEET 1.

ATTORNEY A. WELIN.

DAVIT FOR HOISTING- AND LOWERING BOATS APPLICATION FILED 11110.2, 1907.

938,448, V yatentd 001;. 26, 1909.

2 SHEETS-33 2.

INVENTOH W//d m;

A TTOHNE) AXEL WELIN, or LoNDoN, ENGLAND,

ASSIGNOR T \VELI N QUADRANT DAVIT, A

oonPoRArIoN or NEW YORK.

'DAVIT r'on HoIs'rING AND LOWERING BOATS.

A'pplication filed December 2, 1907.

Specification of Letters Patent.

Patented Oct. 26, 1909. Serial No. 404,809.

T 0 all whom it may concern:

Be it known that I, Axnr. VVELIN, a subject of the King of Sweden, and a resident of London, England, have invented certain new and useful Improvements in Davits for Hoisting and Lowering Boats, of which the I following is a specification.

This invention relates to davits for hoisting and lowering boats, particularly adapted for use on battleships and other war vessels. In this class of Vessels the boats are frequently carried on lofty superstructu'res situated some distance inboard and much, difficulty has been encountered in causingVt-he requisite outreach of the davit to carry the boat clear of the side of the vessel in order to lowerit, and this is particularly true when the heavy weight of the boats usually carried by vessels of this class is considered. Increasing the length of the clavit arm cannot be continued indefinitely without subjecting it to dangerous strains.

My present invention is designed toovercome these difficulties.

In the accompanying drawings I have illustrated preferred embodiments of my in' vention, one where manual power is employed for-handling comparatively light boats and the other where an electric or other power motor is employed for handling launches and other heavy boats.

In these drawings Figure 1 is an elevation showing a manually operated mechanism embodying my invention. Fig. 2' 'is a similar view showing mechanism embodying my invention adapted to be operated by an electric or other power motor.

Referring to Fi 1, A indicates a davit' arm having at its lower end a toothed segment or sector a. B is a frame rigidly se cured to the ve .l, and Z) isa worm supported in the flame to have rotary, but not longitudinal movement. The worm extends through a threaded nut C which is slidably supported on a rod 0 also mounted in the frame, and the davit arm is pivoted to the nut as indicated by (Z. As shown the pivotal connection is at what I shall term the rear side of the davit arm and it will be observed that with the pivot (Z as a center the radii of the toothed segment graduall increase from its rear ond to its front out I) is a rack rigidly supported upon the vessel and with the teeth of which the teeth I i l on the segment a may engage. As shown, the rack inclines downward from its rear to its front end, and when the davit arm is in itsnormal position which, in Fig. 1, is substantially .vertical, the segment is engaged at its shortest radii with the rear end of the rack. By rotating the worm the nut will be caused to travel from the position shown in Fig. 1 to the other end of the worm and this will result in moving the arm through an arcof substantially as indicated by the dotted lines. As the radius of the segment increases toward its front end it will always keep in proper engagement with the inclined rack and the arm will be moved positively and without undue strain on any part of the mechanism. By thus increasing the arc of movement of the davit arm the boat can be swung outboard to a suflicient extent to clear the side of the vessel without increasing the length of the davit arm to a dangerous extent. Furthermore, there will be no especial difliculty in bringing the boat inboard as the greatest leverage will be available when most desired. It is also obvious that the teeth will prevent any slipping movement between the segment and the inclined support on which it rolls.

' Any means may be employed to rotate the worm, and asshown, I employ a crank shaft F connected to the inner end of the worm and supported in a standard f.

In F ig. 2 the same principle is involved but the illustration is somewhat diagrammatical. Here two curved davit arms A A are shown and (Z indicates the pivotal connection to the nuts which will travel .on the worms b. Each davit arm is provided at its lower end with a toothed segment or sector a which has increasing radii from its rear to its front end with relation to the pivot d,

and coiiperates with an inclined rack E. In this case the worms are designed to be 'op erated by an electric or other power moton' As shown. I-I indicates an electric motor, I a rheostat, K a controller and 7c a gear which is driven by the motor shaft, and which gear is connected to clutch members 2 one on each sidethereof, and which are adapted to cooperate respectively with clutch members Z Z, and a lever 02. serves to control the engagcment or release of the several. clutch member's! To each of the clutch members Z Correction, in Letters Patent No. 938,448.

a shaft nis secured which carries a bevel pinion which engages a bevel gear 79. This gear 79 carries a smaller bevel gear 9 concentric therewith which engages with a similar gear 7* on the ends of the respective Worms 6. Evidently when the motor shaft is rotated and the clutch lever on is operated either of the worms 7) may be-rotated by the motor shaft at reduced speed and with increased power.

VVherever I have used the-word. segment or sector lvhave used it not in the sense of a curve relating more particularly to a portion of a circle, but really in the broader sense of any suitable curved portion.

\Vithout limiting myself to the precise details of construction illustrated and described, I claim:

It The combination of a davit arm, a movable pivot on which the arm may turn, a segl'nent on the lower end of the arm increasing in radii with respect to the pivot from its rear to its front end, an inclined support-on which the segment may roll, means for preventing any slipping between the segment and inclined support, and means for moving the pivot 2. The combination of a davit arm, a movable pivot on which the arm may turn, a toothed segment on the lower end of the arm increasing in radius with respect to the pivot from its rearto its front end, a rack inclined downwardly fromits rear to its [SEAL.]

i l u said patent, as shown by the record of assignments in this oflice; and that Letters Patent should be read with this :correction therein that the same may conform l to the record of the case in the Patent ()fiiee. I

Signed and sealed this th day of November, A. D., lQOQ.

front end and on which the segment may roll, and means for moving the pivot.

3. The combination of a davit arm, a worm supported to have rotary but not longitudinal movement, a nut movable on said worm and to which the davit arm is pivoted, a toothed segment on the lower end of the arm which increases in radius with respect to the pivot from its rear to its front end, a rack inclining downwardly from its rear to its front end and on which the said segment may roll, and means for rotating t e worm.

4. The combination of a davit arm, a Worm supported to hare rotary but not longitudinal movement, a' nut movable on said. worm and to which the davit arm is pivoted, a toothed segment on the lower end of the arm which increases in radius with respect to the pivot from its rear to its front end, a rack inclining downwardly from its rear to its front end and on whiehthe said segment may roll, a motor, and gearing interposed between the motor and the worm for rotating the worm at decreased speed but increased power.

In Witness whereof, I have signed mv name to the foregoing spccification'in the presence of two subscribing witnesses.

AXEL' \VELIN.

\Vitnesses:

(inolmn H. SCIIKODER, Jos. F. OBRIEN.

It is hereby certified that Letters latent No. 938,448, granted October 26 i 1909, upon the application of Axel Welin, of London, England, for an improvement; in Davits for Hoisting and Lowering Boats, were erroneously issued to Welin i Quadrant Davit, a corporation of New York, as owner of said invention; whereas said Letters Patent should have been issued to lVeZin Dam'zf and Laned De G'mot 00., Consolidated, a cmymraion 0f .ZVew Iark, as assignee of the entire interest in the said E. B. MOORE,

Uommisse'oner of Patients.

Correction, in Letters Patent No. 938,448.

a shaft nis secured which carries a bevel pinion which engages a bevel gear 79. This gear 79 carries a smaller bevel gear 9 concentric therewith which engages with a similar gear 7* on the ends of the respective Worms 6. Evidently when the motor shaft is rotated and the clutch lever on is operated either of the worms 7) may be-rotated by the motor shaft at reduced speed and with increased power.

VVherever I have used the-word. segment or sector lvhave used it not in the sense of a curve relating more particularly to a portion of a circle, but really in the broader sense of any suitable curved portion.

\Vithout limiting myself to the precise details of construction illustrated and described, I claim:

It The combination of a davit arm, a movable pivot on which the arm may turn, a segl'nent on the lower end of the arm increasing in radii with respect to the pivot from its rear to its front end, an inclined support-on which the segment may roll, means for preventing any slipping between the segment and inclined support, and means for moving the pivot 2. The combination of a davit arm, a movable pivot on which the arm may turn, a toothed segment on the lower end of the arm increasing in radius with respect to the pivot from its rearto its front end, a rack inclined downwardly fromits rear to its [SEAL.]

i l u said patent, as shown by the record of assignments in this oflice; and that Letters Patent should be read with this :correction therein that the same may conform l to the record of the case in the Patent ()fiiee. I

Signed and sealed this th day of November, A. D., lQOQ.

front end and on which the segment may roll, and means for moving the pivot.

3. The combination of a davit arm, a worm supported to have rotary but not longitudinal movement, a nut movable on said worm and to which the davit arm is pivoted, a toothed segment on the lower end of the arm which increases in radius with respect to the pivot from its rear to its front end, a rack inclining downwardly from its rear to its front end and on which the said segment may roll, and means for rotating t e worm.

4. The combination of a davit arm, a Worm supported to hare rotary but not longitudinal movement, a' nut movable on said. worm and to which the davit arm is pivoted, a toothed segment on the lower end of the arm which increases in radius with respect to the pivot from its rear to its front end, a rack inclining downwardly from its rear to its front end and on whiehthe said segment may roll, a motor, and gearing interposed between the motor and the worm for rotating the worm at decreased speed but increased power.

In Witness whereof, I have signed mv name to the foregoing spccification'in the presence of two subscribing witnesses.

AXEL' \VELIN.

\Vitnesses:

(inolmn H. SCIIKODER, Jos. F. OBRIEN.

It is hereby certified that Letters latent No. 938,448, granted October 26 i 1909, upon the application of Axel Welin, of London, England, for an improvement; in Davits for Hoisting and Lowering Boats, were erroneously issued to Welin i Quadrant Davit, a corporation of New York, as owner of said invention; whereas said Letters Patent should have been issued to lVeZin Dam'zf and Laned De G'mot 00., Consolidated, a cmymraion 0f .ZVew Iark, as assignee of the entire interest in the said E. B. MOORE,

Uommisse'oner of Patients.

Correction in Letters Patent No. 938,448.

it is hereby veriified that Letters Patent No 938,448. granted October 26 1909, upon the application of Axel Weiin. of London, England, for an improvement in Davits for Hoisting and Lowering Bouts," were erroneously issued to Welin Quadrant Davit, a corporation of New Y01'k,"as owner of said invention; whereas said Letters Patent should have been issued tu WeZ/n Dam] and Lam: (3 0 Grout Ck. bnsulidritcd, a c nmratz'on rgf New York, as assignee of the entire interest in said patienf, as shown by the record of asbignments in this office; and that the said Letters Patent should be read with this correction therein that the same may (-unform to the reenrd of the ease in the Patent ()fliee. V

Signed and sealed this 30th day of November, A. D., 1908.

{xi-mu] E. I MOORE,

Commissioner of Patents. 

